> ## Documentation Index > Fetch the complete documentation index at: https://docs.techfootintl.com/llms.txt > Use this file to discover all available pages before exploring further. # Introduction > Billspree — a billing and AR platform for recurring, usage-based, and consolidated billing models. ## Welcome to Billspree Billspree is a billing and accounts-receivable platform built for recurring service businesses — flat subscriptions, metered usage, and consolidated multi-service invoicing, with a formal accounting ledger behind every balance. ## The Six Layers Parent entities above child entities — each billed in its own right, with its own AR position. Pricing Contexts define the structure; Pricing Modules supply the rates and rules. Flat, tiered, volume, and usage-based pricing from the same engine. Billing accounts and subscriptions — one consolidated invoice per account, or one per service. Batch bill runs across your whole book: draft, adjust, post, publish. Credit and debit notes, cash application, dunning, collections — every action posted to a formal subledger. Sales and payments, aged receivables, bill-run output, and usage — read from the same records. ## Get Started Start here — what the platform does, and what it deliberately does not. Ask about customers, bills, and Pricing Contexts in plain language — and get clear answers from your data. Integrate Billspree with your existing systems — parties, pricing, subscriptions, usage, and bill runs.